FUNCTIONUnder review

IsAlpha

IsAlpha(cString) -> lResult

Checks whether the first character is a letter.

IsAlphaAdvPL

01 · OVERVIEW

Overview

The contract covers the first position and describes uppercase or lowercase A–Z. A letter-starting string may contain digits and symbols later. It therefore validates neither an entirely alphabetic string nor international names. (Sources: refs. 1–1.)

02 · SYNTAX

Syntax

IsAlpha(cString) -> lResult

Parameters

cString

CharacterRequired

String to analyze.

Return value

Logical result about the first character.

03 · PRACTICAL EXAMPLE

Commented example

#Include "Protheus.ch"

User Function Ed494()
    // Only the first character is checked.
    ConOut(IsAlpha("A1"))
    ConOut(IsAlpha("1A"))
Return Nil

Expected result

Results: true and false. Under review: editorial example neither compiled nor run in Protheus. Check includes, release, RDD and context before testing.

BEST PRACTICES

For whole-string validation, define the expected grammar and handle empty input, spaces and encoding explicitly.
Under review: editorial example neither compiled nor run in Protheus. Check includes, release, RDD and context before testing.